where C is the number of times the solar radiation is concentrated, of which a fraction 0.704 resulted in Br*, 0.259 in Br and 0.963 in I. Similar estimates for I2 and Br2 are also included. For all the initial pressures of IBr considered, it was assumed that 4% by number density of /2 and Br2 were present at 300°K, according to the law of mass action. Thereafter, all the densities varied with time. The absorption rate is proportional to IBr pressure for low pressures (and absorption lengths of 1 cm), until at about 50 torr essentially all the photons are absorbed. The degeneracy factor for the upper laser level Br* is 2, while that of the lower laser level Br(2P3/2) is 4. The population inversion AN for lasing is then TABLE 1 LIST OF REACTIONS
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